Submission #1095549

#	Time	Username	Problem	Language	Result	Execution time	Memory
1095549		pokmui9909	Virus Experiment (JOI19_virus)	C++17	6 / 100	2031 ms	12676 KiB

virus

#include <bits/stdc++.h>
using namespace std;
using ll = long long;

#define x first
#define y second

const ll INF = 1e18;
ll N, M, K, U[805][805]; string S;
ll Mx[16], App[100005];

ll f(char c){
    if(c == 'N') return 0;
    if(c == 'S') return 1;
    if(c == 'W') return 2;
    if(c == 'E') return 3;
}
ll g(vector<ll> &V){
    ll r = 0;
    for(ll i = 0; i < 4; i++){
        if(V[i]) r |= (1 << i); 
    }
    return r;
}

void init(){
    string T = S;
    while(S.size() <= 100000){
        for(auto e : T) S.push_back(e);
    }
    for(ll k = 0; k < 16; k++){
        ll pv = -1;
        for(ll i = 0; i < S.size(); i++){
            if(!(k & (1 << f(S[i])))){
                Mx[k] = max(Mx[k], i - pv - 1); pv = i;
            }
        }
        if(pv == -1) Mx[k] = 100000;
        App[Mx[k]] |= (1 << k);
    }
    for(ll i = 100000; i >= 1; i--){
        App[i - 1] |= App[i];
    }
}
bool In(ll x, ll y) { return (1 <= x && x <= N && 1 <= y && y <= M); }

ll Vir[805][805];
ll dx[4] = {-1, 1, 0, 0}, dy[4] = {0, 0, -1, 1};

bool chk(ll x, ll y){
    ll b = 0;
    for(ll i = 0; i < 4; i++){
        ll nx = x + dx[i], ny = y + dy[i];
        if(In(nx, ny) && Vir[nx][ny]) b |= (1 << i);
    }
    if(App[U[x][y]] & (1 << b)) return 1;
    return 0;
}

int main(){
    cin.tie(0) -> sync_with_stdio(0);

    cin >> K >> N >> M >> S;
    for(ll i = 1; i <= N; i++){
        for(ll j = 1; j <= M; j++){
            cin >> U[i][j];
        }
    }
    init();
    ll mn = 1e18, cnt = 0;
    for(ll p = 1; p <= N; p++){
        for(ll q = 1; q <= M; q++){
            if(U[p][q] == 0) continue;
            fill(Vir[0], Vir[804] + 805, 0LL);
            queue<pair<ll, ll>> Q;
            Q.push({p, q});
            Vir[p][q] = 1;
            ll Res = 1;
            while(!Q.empty()){
                ll x = Q.front().x, y = Q.front().y; Q.pop();
                for(ll i = 0; i < 4; i++){
                    ll nx = x + dx[i], ny = y + dy[i];
                    if(!In(nx, ny) || U[nx][ny] == 0 || !chk(nx, ny) || Vir[nx][ny]) continue;
                    Vir[nx][ny] = 1; Res++;
                    Q.push({nx, ny});
                }
            }
            if(mn > Res){
                mn = Res, cnt = 1;
            } else if(mn == Res){
                cnt++;
            }
        }
    }
    cout << mn << '\n' << cnt;
}

Compilation message (stderr)

virus.cpp: In function 'void init()':
virus.cpp:33:25: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |         for(ll i = 0; i < S.size(); i++){
      |                       ~~^~~~~~~~~~
virus.cpp: In function 'll f(char)':
virus.cpp:17:1: warning: control reaches end of non-void function [-Wreturn-type]
   17 | }
      | ^

• Subtask 1: 0 / 14
• Subtask 2: 6 / 6
• Subtask 3: 0 / 80